Dynamo-electric machine.



W. H. FROST. DYNAMO ELECTRIC MACHINE.

APPLIOATION FILED JULY 25. 1904.

Patented July 13, 1909.

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DYNAMO ELECTRIC MACHINE.

APPLICATION FILED JULY 25. 1904.

Patented July 13, 1909.

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L W 5 w o f r P H .r w n m m P v 1 W. H. FROST.

DYNAMO ELECTRIC MACHINE. APPLICATION FILED JULY 25, 1904.

928,037. Patented July 13, 1909.

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INVENTOf-P: m V\ /'///a/'n 7% F7 [3y Q UNITED STATES PgrE T OFFICE.

WILLIAM H. FROST, OF SOHENEGTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

DYNAMO-ELECTBIC MACHINE.

Specification of Letters Patent.

" Patented July 13, 1909.

A Application filed July 25, 1904. Serial No. 218,004.

To all whom it may concern:

Be it known that I, WILLIAM H. FROST, a citizen of the United States,residing at. Schenectady, county of Schenectady, State of New York, haveinvented certain new and useful Improvements in Dynamo-ElectricMachines, of which the following is a specification.

In the operation of dynamo'electric "machines it is frequently desirablethat the movable member shall rotate at a very high speed. This isparticularly true for instance withfield magnet structures directlyconnected to and driven by steam turbines.

The object of my present invention is the production of a revolvingfield magnet which 1 is simple and easy of construction and is welladapted to sustain the stresses produced by its operation at highspeeds.

The various features of novelty which characterize my invention arepointed out withparticularity in the claimsannexed to and forminga partof this specification. For a better understanding of my invention,however, reference may be had to the accompanying drawings anddescription in which I have illustrated and described my invention.

Of the drawings, Figure 1 is an end elevation of a four-pole rotatingfield magnet with parts broken away and in section; Fig. 2 is a sideelevation of the construction shown in Fig. 1 with a portion in sectionon the line 2 2 of Fig. 1; Fig. 3 is a perspective view showing themethod of assembling the units forming the core or frame of the fieldmanget; Fig. 4 is an elevation on a plane parallel to the shaft'ofthe-field magnet and to the line 4 4 of Fig. 1, a portion of theright-hand end of this figure in section on the line 4 4; Fig. 5 is apartial end elevation showing a portion of a field magnet having morethan four poles; Fig. 6 is an elevation of a lamina used in the form ofa body unit for the magnet of Fig. 5; Fig. 7 is an elevation, and Fi8'is a plan view being partly in section 0 a portion of the field magnetshown in Fig. 5; and Figs. 9, 10 and 11 are elevations of elements ofthefield magnet shown in Fig. 5.

Referring first to the construction shown in- Figs. 1 to 4, inclusive,the core of the field magnet which is supported on the shaft 1 comprisesa body portion 2 and polar portions 3. The body portion and the polarportions are made up of a number of units which may each consist of asingle lamina but preferably are formed of a number of laminae rivetedtogether, The units 4 of which the body 2 is formed are shown clearly inoutline in Figs. 1 and 3. Each unit 4 is symmetrical about axes whichextend midway between acent polar portions 3 but is not symmetricalabout axes parallel to the edges of the polar pieces. The outline of thebody 2 is substantially rectangular. Each unit 4, however, has portionscut away at a pair of diametrically-opposed corners to form at eachcorner a pair of recesses 5 5 separated from each other by a surface 6.It will thus be observed that each of the four sides of the units 4 maybe regarded as formed with a recess 5. The recesses 5 areunsymmetrically located in these sides, however, successive notchesbeing located at opposite sides of the center of each side of the unit4.

The units 4 are each formed with a central aperture through which theshaft 1 passes. The shaft 1 is formed with a keyway and carries a key 7which extends parallel to its axis. The units 4 are formed with foursimilar key-ways 8, adjacent key-ways being separated by equal angulardistances. In assembling the units 4 on the shaft adjacent units aredisplaced a quarter of a turn with respect to each other. Preferablysuccessive units are angularly displaced in the same direction so thatif there is any difference in thickness between the body and edgeportions of the stock from which the laminae are stamped no distortionof the body 2 will result therefrom. WVhen the units forming the bodyportion are assembled two parallel rows of recesses will be formed ineach side of the rectangular body portion. Bolts or rivets 9 serve tosecure {)ogether the assembled units 4 forming the ody 2.

Each polar portion 3 is formed of a number of units 10, each of whichpreferably consists of a number of lamina riveted together. Each unit 10comprises a body portion 11, tip portion 12, and tongue-portion 13. Thetongue portion 13 which extends inwardly from the inner end of each unit10 is located at one side of the center of the unit. In assembling thepolar portions alternate units 10 are reversed. This has the effect ofcreating two parallel rows of tongue portions 13 with adjacent tongueportions in-each row separated by a space equal to the thickness of theunits. The units comprising each polar portion are secured together by anumber of bolts or rivets 14:.

' In'assenibling the body portion and polar portions the two rows oftongues of each polar projection are inserted in the corresponding rowsof recesses formed in each side of the body portion. Each tongue has arectangular-shaped opening 15 formed in it. Corresponding openings 16are formed in the units t and the polar portions are locked to the bodyportion by pairs-of reversely-tapered wedges 17 which pass through theopenings 15 in onel row of tongues and corresponding openings 16 in theunits 4. It will be observed that with this construction each polarprojection is locked to every unit of the body portion, and that thestress given to one body unit by one polar portion is balanced by thestresses given to the body unit by the other polar portions.

Washers 18 placed on the bolts or rivets 9 near their ends and beyondthe ends of the core of the polar portions 3 'proper separate certain ofthe body units to form spaces 19 and 20 in which the ends of theU-shaped coil-retaining straps 22 are inserted. The straps 22 embracethe ends of the coils 24 which surround the polar portions. The ends ofthe straps are slotted and are re tained in place by the wedges 17.

In the construction shown in Figs. 5 to 11, inclusive, a vertical shaftfield magnet is shown formed with a larger number of polar projectionsthanthe field magnet shown in Figs. lto a inclusive. The units 31 whichcorrespond to the body units a of the fourpole construction, aredovetailed into the ends of the spider arms 32. In the constructionshown there are as many spider arms as polar portions. The polarportions 33 of this construction are similar to the polar portions 3 ofthe construction shown in Figs. 1 to 4 except that the rows ofprojections or tongues 34 are closer together, the inner edges 34: ofthe tongues in the two rows being in the same radial plane.

Each unit 31 is formed with three recesses 35 each of which receives oneset of projections from a pole piece 33. The recesses 35 in each unitare at one side of the lines passing through the centers of thecorresponding pole pieces. In assembling the units 31 adjacent units arereversed so that two rows of recesses are formed into which theprojections from the pole pieces 33 may enter.

'1? above described. Bolts 38 are employed to secure the assembled bodyportions together.-- Apertured members 39 placed at the ends of thefield magnet structure serve seems? as links for connecting together thebolts which are located where the body units break joint. The members 39also serve as washers to separate certain of the end units to formspaces in which the coil end supports 4-0, similar to the supports 22 ofthe first con struction, are secured.

Other link members 45 secured to the bolts at the lower end of the fieldmagnet construction serve as stops or key-retaining devices to engagesuch of the wedges or keys36 as have their lower ends the thicker andhold them in place.

I have shown my machine as being provided with a plurality ofindependent side braces or coil supports between each two polarportions. ln the arrangement illustrated in Figs. 1 to 4, these coilsupports are indicated by the numeral 28, and are formed with thesurfaces 30 which engage the sides of adjacent windings 24:. Each ofthese coil supports is fastened. by a bolt 29 .to a'pair of links 26.These pairs of links are arranged at intervals along each corner of thebody portion of the magnet, and are secured in spaces 25 by bolts 27.These spaces 25 are formed between the unnotched corners of adjacentbody units of each set. In the arrangement of Figs. 5 to 11, the coilsupports or side braces are indicated by the numeral 44:, and are formedwith recesses. Keys 42 slide in under-cut recesses formed in the unitsbetween the pole-pieces. The recesses in the side braces interlock withthe outer portion of the keys 4:2. The upper portions of the members 39located at the lower end of the field magnet structure are extended, asindicated at 4:1, to form stops or key-retaining devices for the lowerends of the keys &2. The keyretaining devices shown in Figs. 5 to 11 arecomprised within my invention, but the construetion and arrangement ofthe coil supports or braces form no part of my invention, but areclaimed in the application of Henry G. Reist, Serial No. 241549, filedMarch 1, 1905.

It will be understood by all those skilled in the art that many changesmay be made in the form of my invention without departing from thespirit thereof.

W hat I claim as new and desire to secure by Letters Patent of theUnited States, is,

1. In a field magnet structure comprising a body portion, polar portionsformed of units detachably secured thereto, keys for securing the polepieces to the body portion, bolts for securing the body units together,and key-retaining devices secured in place by said-bolts.

2. In a field magnet, a laminated body portion formed of units each unitbeing formed with notches or recesses to receive one tongue from each ofa plurality of polar projections, and polar projections formed each withtwo rows of notched or recessed tongues out of line with each other.

3. In a field magnet structure, a laminated body portion formed ofsimilar units, adjacent units being angularly displaced with respect toeach other, each of said units being formed with a plurality oftongue-receiving notches or recesses, and polar projections formed withtwo sets of notchor IGCGSS-QlltGIlIlf" tongues, said sets of tonguesbeing out of line with each other.

4. In a four-pole field magnet structure, a body portion composed of aseries of similar units, each of said units being provided with atongue-receiving notch. or recess for each polar projection, saidrecesses being unsymmetrically placed in said units, and adjacent unitsbeing angularly displaced with reference to each other to form-two setsof units, and polar projections formed each with one set of tongueswhich enter which enter the recesses in one set of body units, and withanother set of tongues which enter the recesses in another set of bodyunits.

6. A four-polemagnet structure the body of which is composed of units,each of the units being rectangular in outline with portions of apair ofdiametrically-opposed corners cut away to form a tongue-receiving notchor recess in each side of each unit, and adjacent units being angularlydisplaced ninety degrees to form two sets of units, four polarprojections each bf which is provided with two sets of tongues, thetongues in one set entering recesses in one set of body units, and thetongues of the other set entering the recesses in the other set of bodyunits.

7. In a field magnet, a laminated body portion formed of units each unitbeing formed with notches or recesses to receive one row of tongues fromeach of three or more polar pro ect10ns, polar projections formed eachwith two rows of tongues out cent those having the notches in which thetongues are received.

8. In a field magnet structure, a body portion formed of similar unitsalternately angularly displaced with respect -to each other, each ofsaid units being formed with three or more tongue-receiving notches orrecesses, polar projections formed with two rows ofinternally-projecting tongues, said rows being out of line with eachother, and means for securing each row of tongues from each polarprojection to ,the units located between the units in which the notchesto receive said'row of tongues are formed.

9. In a field magnet structure, polar projections formed each with tworows of notch or recess entering tongues out of line with each other,and a laminated body portion formed of-units secured togetherindependently of said polar projections, each unit being formed withnotches or recesses to receive one tongue fromeach end of a plurality ofsaid polar projections.

10. In a field magnet structure, a plurality of polar projections eachof which is pro vided with two sets of recess entering tongues, a bodyportion comprising a plurality of sets of units connected togetherindependently of said polar projections, the units in each set beingsimilar and similarly placed and provided each with a plurality oftongue receiving notches or recesses, and means for securing said polarprojections to said body portion with one set of tongues from each polarprojection entering the recesses in one set of body units and the otherset of tongues from said, polar projections entering the recesses inanother set of body units.

11. In a field magnet structure, polar projections formed each with tworows of tongues out of line with each: other, a lam1- nated body portionformed of units connected together independently of said polarprojections, each unit being formed with notches or recesses to receiveone row of tongues fromeachof three or more polar projections,

,and means for securing each of the tongues of said projections to thebody units adjacent to those having the notches 1n which the tongue isreceived.

In witness whereof I have hereunto set my hand this 22nd day of July,1904.

\WILLIAM H. FROST. Witnesses: 1

BENJAMIN B. HULL, HELEN ORFORD.(

